نتایج جستجو برای: modified voltammetric methods

تعداد نتایج: 2077917  

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه رازی - دانشکده علوم 1391

we have two part in this thesis, at first: the interaction of native calf thymus dna (ct-dna) with two anthraquinones including quinizarin (1,4- dihydroxy anthraquinone) and danthron (1,8- dihydroxy anthraquinone) in a mixture of 0.04 m brittone-robinson buffer and 50% of ethanol were studied at physiological ph by uv-vis absorption, florescence, circular dichroism spectroscopic methods, viscos...

2009
Yasushi Takemura Yasuyuki Shimada

Chiral properties were investigated in Cu and Cu2O composite films prepared by magneto-electrodeposition. The Cu-Cu2O films were electrodeposited in a CuSO4 and Na2SO4 aqueous solution under magnetic fields B (2 and 5 T) parallel (+B) or antiparallel (–B) to the faradaic current. The magneto-electrodeposited films were used as modified electrodes, and the chiral voltammetric behaviors were obse...

2010
Z. M. Wang H. W. Guo E. Liu G. C. Yang N. W. Khun

To improve reproducibility, stability and sensitivity, a bismuth (Bi) thin film was coated on glassy carbon (GC) substrates which surfaces were modified with a porous thin layer of polyaniline (PANI) via multipulse potentiostatic electropolymerization to form Bi/PANI/GC electrodes (Bi/PANI/GCEs). The Bi/PANI/GCEs were used successfully for simultaneous detection and determination of Cd2þ and Pb...

1999
Shubo Han Xin Li Guangmei Guo Yusheng Sun Zhuobin Yuan

A voltammetric biosensor was developed for the assay of microorganism populations. A tetracycline-modified glassy carbon electrode was used in the construction of the biosensor and an electrochemical cell with an elastic base was employed in the measurement. The possible mechanism of the electrode response was discussed. The determination limit of the microbial populations was 2–5 × 104 cells w...

A multiwall carbon nanotubes-modified carbon paste electrode (MWCNTs/MCPE) wasfabricated and used to study the electrooxidation of penicillamine (PA) by electrochemicalmethods in the presence of methyldopa (MDOP) as a homogeneous mediator. Theelectrochemical oxidation of PA on the new sensor has been carefully studied. The kineticparameters such as electron transfer coefficient, α, and catalyti...

2005
Koichi Aoki Qiang Ke

Suspensions of polyaniline-coated latex particles 13 μm in diameter showed the integer-fold voltammetric currents at the microelectrode of which size was similar to the diameter of the particles. The currents did not vary with concentrations of polyaniline particles but varied accidentally with each voltammetric run. They were caused by the reduction of a few polyaniline particles adsorbed on t...

Journal: :Analytical sciences : the international journal of the Japan Society for Analytical Chemistry 2006
Wei Sun Jiayu You Xuan Hu Kui Jiao

A novel voltammetric method for the determination of microamounts of fish sperm double-stranded (ds) DNA based on its interaction with phenosafranine (PSF) is proposed in this paper. In a pH 3.5 Britton-Robinson (B-R) buffer solution, PSF had a well-defined second-order derivative linear-sweep voltammetric reductive peak at -0.32 V (vs. SCE) on a mercury electrode. After the addition of dsDNA i...

Journal: :jundishapur journal of natural pharmaceutical products 0
nadereh rahbar nanotechnology research center, school of pharmacy, ahvaz jundishapur university of medical sciences, ahvaz, ir iran; department of medicinal chemistry, school of pharmacy, ahvaz jundishapur university of medical sciences, ahvaz, ir iran; department of medicinal chemistry, school of pharmacy, ahvaz jundishapur university of medical sciences, ahvaz, ir iran. tel: +98-6113738378, fax: +98-6113738381 hooshang parham department of chemistry, shahid chamran university, ahvaz, ir iran

conclusions this easily fabricated electrode together with the fast and sensitive sw voltammetry was successfully applied for the determination of concentration of atz at trace levels, in different water samples. results the results revealed that decrease in peak current was proportional to atz concentration over the range of 5-75 ng/ml. the limit of detection (lod) and limit of quantification ...

Journal: :Proceedings of the American Mathematical Society 1955

2013
Laura Siqueira de Oliveira Ana Paula dos Santos Poles Marco Antonio Balbino Matheus Manoel Teles de Menezes José Fernando de Andrade Edward Ralph Dockal Heloísa Maria Tristão Marcelo Firmino de Oliveira

A fast and non-destructive voltammetric method to detect cocaine in confiscated samples based on carbon paste electrode modified with methoxy-substituted N,N'-ethylene-bis(salcylideneiminato)uranyl(VI)complexes, [UO2(X-MeOSalen)(H2O)] · H2O, where X corresponds to the positions 3, 4 or 5 of the methoxy group on the aromatic ring, is described. The electrochemical behavior of the modified electr...

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